Overhaul of the frontend on waiters, orders, and payment events

Manager Dashboard: product reorder/bulk actions, preference sub-choices
UI, expanded reports with DateInput component, waiter management updates,
order detail improvements, Docker config and backend dockerignore added.

Backend: table groups, auto-numbering, has_active_order flag, expanded
reporting endpoints, waiter zone management, user schema updates, system
router additions, table router fixes.

Waiter PWA: TableDetailPage order/payment event improvements.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/models/order.py

@@ -22,6 +22,8 @@ class Order(Base):
     items = relationship("OrderItem", back_populates="order", cascade="all, delete-orphan")
     waiters = relationship("OrderWaiter", back_populates="order", cascade="all, delete-orphan")
     print_logs = relationship("PrintLog", back_populates="order", cascade="all, delete-orphan")
+    audit_logs = relationship("OrderAuditLog", back_populates="order", cascade="all, delete-orphan")
+    discounts = relationship("OrderDiscount", back_populates="order", cascade="all, delete-orphan")
 
 
 class OrderWaiter(Base):
@@ -52,9 +54,15 @@ class OrderItem(Base):
     added_at = Column(DateTime, default=datetime.utcnow)
     printed = Column(Boolean, default=False, nullable=False)
 
+    # Payment tracking
+    paid_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+    paid_at = Column(DateTime, nullable=True)
+    payment_method = Column(String, nullable=True)  # 'cash'|'card'|'other' — future use
+
     order = relationship("Order", back_populates="items")
     product = relationship("Product", back_populates="order_items")
-    added_by_user = relationship("User", back_populates="order_items")
+    added_by_user = relationship("User", foreign_keys=[added_by], back_populates="order_items")
+    paid_by_user = relationship("User", foreign_keys=[paid_by], back_populates="items_paid")
 
 
 class PrintLog(Base):
@@ -70,3 +78,44 @@ class PrintLog(Base):
 
     order = relationship("Order", back_populates="print_logs")
     printer = relationship("Printer", back_populates="print_logs")
+
+
+class OrderAuditLog(Base):
+    """Immutable append-only audit trail for every action on an order."""
+    __tablename__ = "order_audit_log"
+
+    id = Column(Integer, primary_key=True, index=True)
+    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False)
+    event_type = Column(String, nullable=False)
+    # ORDER_OPENED | ITEMS_ADDED | PAYMENT | ORDER_CLOSED | ORDER_CANCELLED | ITEM_CANCELLED
+    waiter_id = Column(Integer, ForeignKey("users.id"), nullable=True)
+    item_ids = Column(Text, nullable=True)      # JSON list of OrderItem ids (for ITEMS_ADDED, PAYMENT, ITEM_CANCELLED)
+    amount = Column(Float, nullable=True)       # total value for PAYMENT events
+    payment_method = Column(String, nullable=True)
+    note = Column(Text, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+    order = relationship("Order", back_populates="audit_logs")
+    waiter = relationship("User")
+
+    @property
+    def waiter_name(self):
+        return self.waiter.username if self.waiter else None
+
+
+class OrderDiscount(Base):
+    """Records a discount applied to an order or a specific item."""
+    __tablename__ = "order_discounts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False)
+    item_id = Column(Integer, ForeignKey("order_items.id"), nullable=True)  # NULL = whole-order discount
+    discount_type = Column(String, nullable=False)   # 'percent' | 'fixed'
+    discount_value = Column(Float, nullable=False)   # e.g. 10.0 = 10% or €10.00
+    applied_by = Column(Integer, ForeignKey("users.id"), nullable=False)
+    applied_at = Column(DateTime, default=datetime.utcnow)
+    reason = Column(Text, nullable=True)
+
+    order = relationship("Order", back_populates="discounts")
+    item = relationship("OrderItem")
+    applied_by_user = relationship("User")